Redefinition of the crater-density and absolute-age boundaries for the chronostratigraphic system of Mars

Details Redefinition of the crater-density and absolute-age boundaries for the chronostratigraphic system of Mars Redefinition of the crater-density and absolute-age boundaries for the chronostratigraphic system of Mars

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011icar..215..603w&link_type=abstract

Icarus, Volume 215, Issue 2, p. 603-607.

Mathematics

Logic

6

Scientific paper

For the boundaries of each chronostratigraphic epoch on Mars, we present systematically derived crater-size frequencies based on crater counts of geologic referent surfaces and three proposed "standard" crater size-frequency production distributions as defined by (a) a simple -2 power law, (b) Neukum and Ivanov, (c) Hartmann. In turn, these crater count values are converted to model-absolute ages based on the inferred cratering rate histories. We present a new boundary definition for the Late Hesperian-Early Amazonian transition. Our fitting of crater size-frequency distributions to the chronostratigraphic record of Mars permits the assignment of cumulative counts of craters down to 100 m, 1 km, 2 km, 5 km, and 16 km diameters to martian epochs. Due to differences in the "standard" crater size-frequency production distributions, a generalized crater-density-based definition to the chronostratigraphic system cannot be provided. For the diameter range used for the boundary definitions, the resulting model absolute age fits vary within 1.5% for a given set of production function and chronology model ages. Crater distributions translated to absolute ages utilizing different curve descriptions can result in absolute age differences exceeding 10%.

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